Closing device for belt fasteners



Filed Jan. 15, 1937 Inventor:

. I WW Patented Aug. 1, 1939 v UNITED STATES PATENT oFFiCs CLOSINGDEVICE FOR- BELT FASTENERS Curt Matthaei, Ofienbachon-the-Main, GermanyApplication January 15, 193'1, Serial No.'120,-773- In Germany February28, 1936 3 Claims. (Cl. 1-494) The invention relates to a clamping orclospermitted to assume positions independent of the ing device for beltfasteners, made of V-shaped general direction of the springs. The jawposiwire clips with hooked limbs, which has osciltion is preferablydetermined by the staple suplating pressure jaws arranged on each sideof port or holder, and the staples themselves. Furthe comb holder. Theinvention has for its obther, the springs exert in closed jaw position 5ject an improvement of these known clamping (Fig. 3) a downwardlydirected force component devices, by providing pressure jaws which, uponwhich is transmitted to the staples, and proinsertion of the wirestaples, clamps or hooks moting the penetration of downwardly curvedadapt themselves to the angle of inclination of staple points. Theroof-shaped staple holder 6 the staple shanks and come together parallelto (Figure 4) has slots 1 transversely to its lon- 10 each other inultimate position. The invention gitudinal direction, to take the staplebend (Fighas for another object to provide a more useful ures 2 and 3.The turned over lips 8 of the staple clamping device of this nature byemploying a holder engage the upper Y limbs 5, 5 of the staple supportmade in such a manner that an staple support 3 whereby the staple holder6 is 5 angularly roof-shaped staple holder can be easily held in thecorrect position between the pressing 5 and interchangeably fittedthereon. jaws for the insertion of the fastening staples or The objectof the invention is attained by the clips. In the clamping deviceaccording to the pressure jaws being fixed to the staple supportinvention staple holders 6 of any width may be by means of freelyexpanding and flexible spiral used so that, for example, if belts areused which springs. Furthermore the staple support has, are wider thanthe pressing jaws I, the number 20 according to the invention, a doubleY-shaped of staples necessary for the whole width of the cross-sectionand the spiral springs of the pressbelt may be inserted into holder 6which can be ing jaws are fixed on the lower Y flange whilst moved alongsupports 3 for application of the the upper Y flange carries the stapleholder in a jaws to consecutive groups of staples. The hooks movable andinterchangeable manner. are held in the usual way by a pin which isadapt- An embodiment of the clamping device accorded to the flattenedpart of the roof-shaped comb. ing to the invention is shown by way ofexample For very thin belts hooks are made of very thin in theaccompanying drawing, in which wire for the insertion of which a toolespecially Figure 1 is an isometric viewof the clamping designed for thepurpose has hitherto been neces- 3 device, sary. This is no longerrequired with the clamp- 0 Figure 2 is a cross-section with insertedstaples ing device according to the invention, since it is before thejaws are closed, merely necessary to use a staple holder with suit-Figure 3 is a cross-section similar to Figure ably narrower subdivisionsfor the thin hooks, 2 but after the closing and fitted to staple support3. 35 Figures 4 and 5 are plan and side views, respec- The clampingdevice according to the inven- 35 tively, of the staple holder. tion ispreferably operated by means of a vise,

As shown in Figure l the pressure jaws I, I the jaws of which engage theoutside of the are fastened to a staple support 3 by means of pressurejaws I of the clamping device. Naturalfreely expanding and flexiblespiral springs 2, 2, ly the pressing together of the pressing jaws istwo springs being preferably arranged on each possible in many otherways. The operation of side. The comb holder 3 is of double Y-shaped theclamping device according to the invention cross-section and the spiralsprings 2, 2 of the can be easily seen from Figures 2 and 3. Bepressurejaws are fastened to the lower Y limbs fore the commencement of thestaple insertion, 4, 4 at the side opposite to the staple holding thepressing jaws I rest on the staple support or portion. As shown in Fig.2, spring 2 is fastened staple holder. Upon pressure being exerted, the45 to jaw I by means of plugs II and I2 having outspiral springs 2expand as well as bend between side threads and a hole or inside thread,respecthe pressing jaws I and the flange portions tively, through whichscrews I3 and I4 are in- 4 of. the staple support 3. As the holder 6serted. The oppositely located Y limbs 5, 5 of serves in this movementof the spiral springs the support 3 carry the roof-shaped staple holderand of the pressing jaws at the same time as 50 B for the fasteningstaples or hooks. In this support for the pressure jaws, the position ofmanner, the jaws I are held by springs 2 in pothe inner surfaces of thepressing jaws adapts sition on either side of, and substantiallyparalitself during the whole pressing-in process to lel to staplesupport 3, as shown in Fig. 2; since the angle of inclination of thestaple shanks. the springs expand as well as bend, the jaws areConsequently the insertion of the hooks always takes place with thepressure surfaces of the jaws fully applied to the hook shanks up to thetime when a complete parallel position is reached after the pressing inis completed (Figure 3). The belt into which the hooks are pressed in isomitted from the drawing for the sake of clearness.

What I claim is:

1. Device for inserting wire staples of the hooked limb type used asbelt fasteners, comprising a support for said staples, a pressure jaw,

said support.

2. Device for inserting wire staples of the type used as belt fasteners,comprising a support, means for removably mounting a staple holder onsaid support, two pressure jaws, and spiral springs fastened to saidsupport below said holder, and to said jaws and extending at an angle toeach other freely to hold jaws one on each side, respectively, of saidholder.

3. Device for inserting wire staples of the type used as belt fasteners,comprising a support hav ing an upper and a lower flange, means forslidably mounting a staple holder on said upper flange, spiral springsmounted on said lower flange extending upwardly on either side of saidholder, and pressure jaws fastened to said springs, one on either side,respectively, of said holder.

CURT MA'I'IHAEI.

